The bizarre antics of sleepwalkers have puzzled police, perplexed scientists, and fascinated writers for centuries. There is an endless supply of stories about sleepwalkers. Person have been said to climb on steep roofs, solve mathematical problems, compose music, walk though plate glass windows, and commit murder in their sleep.
How many of these stories have a basic in fact, and how many are pure fakery？ No one knows, but if some of the most sensational stories should be taken with a barrel of salt, others are a matter of record.
In Revere, Massachusetts, a hundred policemen combed a waterfront neighborhood for a lost boy who left his home in his sleep and woke up five hours later on a strange sofa in a strange living room, with no idea how he had gone there.
There is an early medical record of a somnambulist who wrote a novel in his sleep. And the great French writer Voltaire knew a sleepwalker who once got our of bed, dressed himself, made a polite bow, danced a minute, and then undressed and went back to bed.
At the university of Iowa, a student was reported to have the habit of getting up in the middle of the night and walking three-quarters of a mile to the Iowa River. He would take a swim and then go back to his room to bed.
The world’s champion sleepwalker was supposed to have been an Indian, Pandit Ramrakha, who walked sixteen miles along a dangerous road without realizing that he had left his bed. Second in line for the title is probably either a Vienna housewife or a British farmer. The woman did all her shopping on busy streets in her sleep. The farmer, in his sleep, visited a veterinarian miles away.
The leading expert on sleep in American claims that he had never seen a sleepwalker. He is Dr. Nathaniel Kleitman, a physiologist at the University of Chicago. He is said to know more about sleep than any other living man, and during the last thirty-five years had lost a lot of sleep watching people sleep. Says he, "Of course, I know that there are sleepwalkers because I have read about them in the newspapers. But none of my sleepwalkers ever walked, and if I were to advertise for sleepwalkers for an experiment, I doubt that I’d get many takers."
Sleepwalking, nevertheless, is a scientific reality. Like hypnosis, it is one of those dramatic, eerie, awe –inspiring phenomena that sometimes border on the fantastic. It lends itself to controversy and misconceptions. What is certain about sleepwalking is that it is a symptom of emotional disturbance, and that the only way to cure it is to remove the worries and anxieties that cause it. Doctors say that somnambulism is much more common than is generally supposed. Some have set estimated that there are four million somnambulists in the United States. Others set the figure even higher. Many sleep- walkers do not seek help and so are never put on record, which means that an accurate count can never be made.
The simplest explanation of sleepwalking is that it is the acting out of vivid dream. The dream usually comes from guilt, worry, nervousness, or some other emotional conflict. The classic sleepwalker is Shakespeare’s Lady Mac Beth. Her nightly wanderings were caused by her guilty conscience at having committed murder. Shakespeare said of her, "The eyes are open but their sense is shut."
The age-old question is: Is the sleepwalker actually awake or asleep？ Scientists have decided that he is about half-and- half. Like Lady Mac Beth, he had weighty problems on his mind. Dr. Zelda Teplitz, who made a ten-year study of the subject, say, "Some people stay awake all night worrying about their problems. The sleepwalker thrashes them out in his sleep. He is awake in the muscular area, partially asleep in the sensory area." In other words, a person can walk in his sleep, move around, and do other things, but he does not think about what he is doing.
There are many myths about sleepwal

A. inconceivable
B. unbelievable
C. suspected
D. implausible